These will work well for places you need articulation but don't want the ball to be able to pull out. The slotted ball joints that use pressure from the outer wall to hold the ball are probably better for situations where you want friction to hold the joint position. BTW, I discovered last night that a drill hole is not needed to remove the support used to print the ball. With the sizes I'm using (1/8" diameter support) the support snaps with some gentle rotational force. :) ﻿

Some hubs for making regular tetrahedral structures using dowels. The hub holes can be easily resized in SketchUp for different diameter dowels. Files are located on Thingiverse here: http://www.thingiverse.com/thing:916646﻿

Used TinToy http://www.thingiverse.com/thing:719762 to make a large network of tetrahedrons. It's very light and quite strong. We now have it hanging in our living room. A version in your Makerspace could be a great way to promote thinking about networks and triangulated structures. ﻿

I am looking for some vendors for LittleBits besides the LittleBits company and radio shack. I also need to find a quote for the Popular Science Kit. If any one can help me out, I would appreciate it!﻿

A fun project that involves some careful planning, measuring, and execution. The bulbs are available on Thingiverse here: http://www.thingiverse.com/thing:561399 Just resize them via SketchUp for the size of the holes in the plywood. All the bulb bases are the same diameter so if you resize one in SketchUp they will all be resized. The LED strip is from AdaFruit. The effect is magical. :)﻿